Honing device



W. P. CANNING HONING DEVICE Filed Nov. 5 1941 INVENTOR P CANNING WILLIAM MMJLMMNMW TORNE Y Patented Dec. 21, 1943 HONING DEVICE William P. Canning, Southbridge, Mass., assignor to American Optical Company, Southbridge, Mass, a voluntary association of Massachusetts Application November 3, 1941, Serial No. 417,639

4 Claims.

' This invention pertains to honing devices and more particularly to improved and more efficient means for honing stones such as is used in lens edging machines for properly edging lenses as is used in the ophthalmic art.

Heretofore, devices of the general class to which this invention pertains used a hone which engaged the surface of an abrading wheel, which hone would ordinarily resiliently press against the surface of the abrading wheel to be honed and ordinarily follow the natural peripheral contour of the wheel surface to be honed.

The present invention contemplates the use of a resiliently mounted hone for engaging the surface of a wheel to be honed, which hone has resilient means to permit the high spots on the wheel to be honed to urge the hone from the axis of the wheel but to prevent the hone from moving in toward the axis of the wheel to be honed beyondv a predetermined amount.

It is therefore an object of the invention to provide a honing device of the class described having a slidably mounted hone for resilient engagement with a surface of a wheel to be trued.

A further object of the invention is to provide a honing device substantiall radially slidable in relation to the axisof the wheel to be trued with adjustment means for determining the amount of movement of the hone in relation to the surface of the wheel.

A further object of the invention is the provision of a movable hone resiliently mounted adjacent the surface of an abrading tool to be trued, with means for adjusting the hone in relation to the surface of the work to be trued so that the hone may be automatically moved away from the surface to be trued an indefinite amount but the movement of the hone toward the surface of the Work to be trued to be limited to a predetermined amount.

Further and other objects may be and may become apparent to those skilled in the art, and it is tobe understood that other objects may present themselves after a perusal of the present disclosure and the claims presented herewith.

It is pointed out that the present disclosure is by way of illustration only and that modifications and changes may be made in the invention and equivalent parts used without departing from the spirit of the invention as defined by the subjoined claims.

In the drawing:

. Fig. 1 is a perspective view of the honing device mounted in position to true the surface of an edging stone used in the ophthalmic art.

Fig. 2 is a top sectional view taken along lines 2-2 of Fig. 3 showing the hone resiliently mounted in the hone holder.

Fig. 3 is a sectional view taken along lines 3-3 of Fig. 1 showing details of construction of the present invention.

Referring to the drawing and more particularly to Fig. 1, a frame 4 has a bed 5 as a component part thereof with a dove tail 5 of a carriage l6 slidably mounted on said bed. A spacing or adjustment guide I engages one side of the dove tail 6 and it is adjustable in relation there to by screws 8. A hone housing 9 is connected to the base If! and permits the hone H to slide in said hone housing 9 with a stud 52 passing through the upper portion of the hone housing 9 into the base Ill.

A more detailed description of the invention may be shown in Figs. 2 and 3 wherein the hone H has a slot l3 therein adapted to receive the body M of the stud l2.

The hone H has a thin metallic strip l5 which in the present instance may be considered as brass, said metallic brass strip l5 going across the bottom, on the sides, and the upper edges of the hone l to provide a wear plate between the hone I! and its carriage E6. The inner edges of the wear plate l5 are turned in On the inside of the slot It as shown at I! and act as gripping means to hold the wear plate in fixed position in relation to the hone H. A guide plate l8 has an aperture I9 therein, which aperture receives the body portion M of the stud. l2. The guide plate I8 is placed within the hone housing 8 and adjacent the upper edges IQ of the metallic wear plate I5. A shoulder 20 below the head of the stud l2 engages the upper surface of the guide plate [8 so that when the stud i2 is securely clamped into the base it) of the carriage iii, the

guide plate l8 engages the upper edges 59 of the metallic Wear plate l5 and holds the hone H from rocking up and down but permits it to move longitudinally in the hone housing.

While the stud l2 may be securely tightened against the hone housing 9 to hold the stud in frictionally locked fixed position, the shoulder 29 on the stud 12 which engages the guide plate I8 is sufficiently spaced therefrom to permit longitudinal movement of the hone H in relation to the stud.

It. will therefore be seen that when the stud I2 is tightened into its final position, the stud is frictionally fixed in relation to the hone housing 9 and the base ill of the carriage It. By virtue of the shoulder 29 which does not clamp the guide plate I8, the hone is free to move to and fro in relation to the carriage I6. A spring 2| is placed within the slot I3, which is located in the hone II, with one end of the spring engaging an end wall of the slot I3, while the other end of the spring engages the body I4 of the stud I2. The spring 2| is an expanding spring and consequently is always urging the left end of the slot I3 away from the stud I 2. However, the right end 22 of the slot I3 causes the portion I I of the wear plate I to engage the lower portion of the stud I2. The action of the spring 2| therefore forces the right end of the hone, by virtue of the spacing member I! against the stud body I4 of the stud I2. It will be seen that when the hone is not in engagement with the edging stone 23, the hone I I is always moved to the extreme left. A collar 24 has a slot 25 therein, which collar is secured to the frame 4 by screws 26. The slot 25 engages an annular groove 21 of a threaded screw 28. The threaded screw 28 has a knurled knob 29 thereon, which when turned rotates the threaded portion 30 of the threaded screw 28. The threaded portion of the screw 30 engages a complemental threaded screw portion in the base of the carriage I6.

In operation, when it is desired to true the edging stone 23 by means of the hone II, the knurled knob 29 is turned clockwise so that the carriage I6 is moved in toward the edging stone 23 until it engages same.

Thereafter, the revolving of the edging stone 23 will bring the various points on the peripheral edge of the edging stone 23 into engagement with the hone I I. As the edging stone continues to revolve, the hone will rub against the peripheral surface of the edging stone and remove the high spots. However, against the action of the spring 2| the high spots in the wheel will have a tendency to move the hone I I away from the wheel and permit the hone I I to bear against the surface of the edging stone 23 after the high spots have caused the hone II to recede.

One of the great advantages of this particular invention is that when the hone II' reaches a low spot on the wheel to be trued, it will not gouge therein since the stud I2 restricts the inward movement of the hone II.

As the edging stone continues to revolve, the I low spots on the wheel will gradually become levelled so that the hone then merely rides on the surface without any appreciable cutting. However, the high spots on the wheel 23 will continue to engage the hone II and be slightly out thereby each time the high spot of the wheel passes under the hone I I. It will therefore be seen that while the wheel is apparently engaging the hone at all surface points, the hone is actually cutting only on the high spots on the wheel while bearing slightly against the surface of the low spots.

From the foregoing, it will be seen that the present hone is really a truing device which permits the wheel to be trued and have a substantially equal radius at all points thereon. The adjustment means for the carriage will permit the carriage to be moved toward or away from the edging stone 23 so that bad defects in the edging stone may only engage the hone on the high spots of the wheel with the hone out of or nearly out of engagement with the edging stone throughout the remainder of the revolution of the edging stone.

While it has been set forth that the honing device may be used for truing an edging stone in cases where the edging stone is periodically trued by a hone, it is also contemplated that the present invention may be used in substantially constant engagement with the edging stone at all times and bearing slightly thereagainst.

By virtue of the adjustment means of the carriage, and the resilient rearward movement of the hone with limiting means for forward motion of the hone, the present disclosure presents a device which may be in constant engagement with the edging stone. A slight adjustment of the threaded screw 28 will permit a fine movement of the hone supporting carriage 28.

From the foregoing, it will be seen that the present invention may be used for periodical truing, or for constant truing of an edger stone or abrading wheel of any nature.

While the present invention has reference to a honing device used in conjunction with an edging machine as used in ophthalmic work, it is to be understood that the device may be used for any other type of machine which may beneficially employ the means for moving the hone as presented in the present disclosure.

Having described my invention, I claim:

1. A honing device for a rotatably mounted abrading wheel, said honing device comprising a support having a slideway therein, a slide member slidably supported in said slideway for movement toward and away from the abrading wheel, means for adjusting said slide member longitudinally of said slideway, said slide member having a guideway therein disposed in the direction of the slideway, a hone member in said guideway and having a longitudinal slot intermediate the ends thereof, a pin-like member extended into the guideway and into the longitudinal slot in the hone and resilient means in said longitudinal slot with one end thereof engaging the portion of the pin-like member in said slot and the other end engaging the end wall of the slot opposed to said pin-like member.

2. A honing device for a rotatably mounted abrading wheel, said honing device comprising a support having a slideway therein, a slide member slidably supported in said slideway having a portion With a threaded bore, a screw member carried by said support and threadedly connected with a portion of the slide member having a threaded bore therein, said slide member having a guideway therein disposed in the direction of the slideway, a hone member in said guideway and having a longitudinal slot intermediate the ends thereof, a pin-like member extending into said guideway and into the longitudinal slot in the hone and resilient means in said longitudinal slot gaging the portion of the pin-like member in said slot and the other end engaging the end wall of the slot opposed to said 3. A device of the character described for truing a rotatably mounted abrading wheel, said device comprising a support having a slideway therein, a slide member slidably supported in said slideway for movement toward and away from the abrading Wheel, means for adjusting said slide member longitudinally of said slideway, said slide member having a guideway therein disposed in the direction of the slideway, a truing member in said guideway and having a longitudinal slot intermediate the ends thereof, said truing member having an end adapted to engage a surface of the abrading wheel, a pinlike member extending into the guideway and with one end thereof en-' pin-like member.-

into the longitudinal slot in the truing member for limiting the movement of said truing member toward the abrading wheel and resilient means in said longitudinal slot with one end thereof engaging the portion of the pin-like member in said slot and with the other end thereof engaging the end wall of the slot intermediate the pin-like member and the abrading wheel for yieldingly urging the truing device in the direction of said abrading wheel.

4. A honing device for a rotatably mounted abrading wheel, said honing device comprising a support having a slideway therein, a slide member slidably supported in said slideway for movement toward and away from the abrading wheel, said slideway having a portion with a threaded bore therein, a screw member on said support threadedly connected with the portion of the slide member having the threaded bore therein, said slide member having a guideway therein disposed in the direction of the slideway, a hone member in said guideway and having a longitudinal slot intermediate the ends thereof, a wear plate on said hone intermediate the hone and the guideway, a pin-like member extending into the guideway and into the longitudinal slot in the 10 hone and resilient means in said longitudinal slot with one end thereof engaging the portion of the pin-like member in said slot and with the other end thereof engaging the end wall of the slot intermediate the pin-like member and 15 the abrading wheel.

WILLIAM P. CANNING. 

